I (stupidly) pointed out that WebDAV was natively supported by both Windows and Mac OS and was quite simple to connect to, and then burned all of my political capital at the company arguing for its adoption --- when we finally got to a meeting on it, rather than simply enable the WebDAV service on the existing FTP Server, it was presented as if I was arguing for a new server, and that said new server should come out of my department's budget....
> KaraDAV performance was very close to mod_dav, and NextCloud performance was incredibly poor.
Client KaraDAV NextCloud mod_dav
Dolphin (KDE) 5 seconds 1 minute 15 seconds 3 seconds
Thunar (GTK) 5 seconds 1 minute 50 seconds 5 seconds
WebDAV Manager.js 4 seconds (no delete) -- --Nowdays i just use (encrypted) SMB over the internet, performance is great and it works on all major systems without additional software. Basically the best and easiest way to transfer (large) files over the network.